The floor of mouth is formed by \ \ \ \ \ \ \ \ \ \ \ muscle. - Combined AIIMS - 2020 (Jodhpur, Bhopal, Patna, Raipur)

Combined AIIMS - 2020 (Jodhpur, Bhopal, Patna, Raipur)

Applied Anatomy

Easy

Appeared in: Combined AIIMS - 2020 (Jodhpur, Bhopal, Patna, Raipur)

Explanation

The floor of the mouth is anatomically referred to as the oral diaphragm.
This diaphragm is formed by the paired Mylohyoid muscles, which join at a central raphe.
The Mylohyoid muscle originates from the mylohyoid line of the mandible and inserts onto the body of the hyoid bone.
Its primary actions include elevating the floor of the mouth, elevating the hyoid bone, and depressing the mandible, all of which are essential for swallowing and speech.

Option A: The Stylopharyngeus muscle is located in the pharynx and is involved in swallowing by elevating the pharynx and larynx, but it does not form the floor of the mouth.
Option C: The Extensor Hallucis muscle is located in the lower leg and is responsible for extending the big toe. It has no anatomical or functional relationship with the structures of the head and neck.
Option D: The Medial Rectus muscle is an extraocular muscle located within the eye socket (orbit). Its function is to move the eyeball medially (adduction).

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomy of the muscles forming the floor of the mouth as background academic context rather than a clinical decision trigger.
Understanding the anatomy of the floor of the mouth is critical during dental procedures, especially when administering local anesthesia, to avoid injuring the lingual nerve or mylohyoid nerve.
Weakness or paralysis of the mylohyoid muscle can lead to dysphagia (difficulty swallowing) and problems with speech articulation, as the initial phase of swallowing is impaired.
The floor of the mouth is a common site for oral cancers. Surgical resection requires detailed knowledge of the muscular and neurovascular structures to ensure complete tumor removal while preserving function.

How to Approach the Question

This is a factual recall question based on anatomical knowledge.
Identify the key anatomical structure mentioned in the question stem: 'floor of mouth'.
Systematically review the options, recalling the location and function of each muscle.
The Mylohyoid muscle is a key component of the suprahyoid muscle group, known to form the oral diaphragm.
Eliminate the other options by identifying their correct anatomical regions: Stylopharyngeus is in the pharynx, Extensor Hallucis is in the leg, and Medial Rectus is in the eye.
This process of elimination confirms that Mylohyoid is the only plausible answer.

Concept Tested & Keywords

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E6 Anatomy Grays 43e Vol 2 Part 1 p. 80-82